MTL 200 Exam Questions and Answers
Graded A+
What are ceramics? - Correct answer-Ceramics are elements composed of at least
two elements, often more, with complex crystal structures that range from purely
ionic to totally covalent.
Anisotropy - Correct answer-directionality of properties
What influences the crystal structure of ceramics? - Correct answer-The electrical
charge of ions and the relative sizes of the anion and cation.
Why must a ceramic molecule be neutral? - Correct answer-The net charge across
the cation and anion must be 0, and the whole ceramic molecule must be neutral.
What do cations and anions prefer in terms of nearest neighbors? - Correct answer-
Cations prefer to have as many nearest neighbor anions as possible, and anions
prefer to have as many cations as possible.
What are the most common coordination numbers in ceramics? - Correct answer-
The most common coordination numbers in ceramics are 4, 6, and 8
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, What happens when the ratio of the radii is greater than 1? - Correct answer-The
coordination number is 12.
What are the 3 types of ceramic crystal structures? - Correct answer-AX, AmXp,
and AmBnXp Type
What are the 3 subdivisions of AX- Type ceramic structure? - Correct answer-1.
Rock salt structure (NaCl) 2. Cesium Chloride Structure (CsCl)
3. Zinc Blende Structutre (ZnS)
What is the main relationship between the unit cell and rock salt structure (NaCl)
and its coordination number? - Correct answer-The main relationship is 2(r_c +
r_a) = a
Its coordination number is 6.
How many anions and cations do you have in a Rock Salt Structure? - Correct
answer-4 anions and 4 cations.
What is the main relationship between the unit cell and cesium chloride structure
(CsCl)and its coordination number? - Correct answer-2(r_c + r_a) = √3 × a
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Graded A+
What are ceramics? - Correct answer-Ceramics are elements composed of at least
two elements, often more, with complex crystal structures that range from purely
ionic to totally covalent.
Anisotropy - Correct answer-directionality of properties
What influences the crystal structure of ceramics? - Correct answer-The electrical
charge of ions and the relative sizes of the anion and cation.
Why must a ceramic molecule be neutral? - Correct answer-The net charge across
the cation and anion must be 0, and the whole ceramic molecule must be neutral.
What do cations and anions prefer in terms of nearest neighbors? - Correct answer-
Cations prefer to have as many nearest neighbor anions as possible, and anions
prefer to have as many cations as possible.
What are the most common coordination numbers in ceramics? - Correct answer-
The most common coordination numbers in ceramics are 4, 6, and 8
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, What happens when the ratio of the radii is greater than 1? - Correct answer-The
coordination number is 12.
What are the 3 types of ceramic crystal structures? - Correct answer-AX, AmXp,
and AmBnXp Type
What are the 3 subdivisions of AX- Type ceramic structure? - Correct answer-1.
Rock salt structure (NaCl) 2. Cesium Chloride Structure (CsCl)
3. Zinc Blende Structutre (ZnS)
What is the main relationship between the unit cell and rock salt structure (NaCl)
and its coordination number? - Correct answer-The main relationship is 2(r_c +
r_a) = a
Its coordination number is 6.
How many anions and cations do you have in a Rock Salt Structure? - Correct
answer-4 anions and 4 cations.
What is the main relationship between the unit cell and cesium chloride structure
(CsCl)and its coordination number? - Correct answer-2(r_c + r_a) = √3 × a
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
